BIO SCI 94 Lecture Notes - Lecture 17: Color Vision, Eutheria, Marsupial

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Amphibians are tetrapods, but they are a transitional group. Most live on land, but they do not have amniotic eggs and thus still need to lay their eggs in water. Reproduction: tetrapods were the first vertebrates that could breed in terrestrial environments, three (cid:373)ajor e(cid:448)olutio(cid:374)ary i(cid:374)(cid:374)o(cid:448)atio(cid:374)s ga(cid:448)e tetrapods this a(cid:271)ility, the amniotic egg. Reptiles are well-adapted for terrestrial life because of three distinguishing features: With the exception of birds, all reptiles are ectothermic, meaning that they do not use internally generated heat to regulate their body temperature. Birds are the only non-mammalian animals that are endothermic. Whether birds began flying from the ground up or from the trees down is still unresolved. Chordata: mammalia (mammals: mammals are a monophyletic class with three lineages: monotremata, marsupiala, and eutheria, three distinguishing characteristics of mammals are: Endothermy they regulate their body temperatures with internally generated heat. Monotremes are the most ancient group of mammals living.